hey all i forgot to take a photo but will get one up tomorrow. the new brake discs i received (vented ones) have a thicker plate on one side and thinner on the other. is this normal or a manufacturing issue? its the same on both of the discs in the box.iv seen this on some pagid discs for the aygo and its now happened with the fremax discs i bought for the ford fiesta. how can this happen from 2 different brands of discs for different cars?

i thought with brake discs the plates should be even thickness on each side?

Check your old rotors. If they wore evenly on both sides then unequal thickness replacements will have a shorter service live. If they wore more on the piston side then that would suggest the new ones are Just Right for the application.

iv attached some pics. overall disc thickness iv measured with the vernier caliper is 20mm at different points so it is in spec for overall thickness. however one plate is around 7.4mm thick and the other plate is around 6.5mm thick.the plate thats caliper piston side is the thicker one.